AES E-Library

AES E-Library

Design and Implementation of an Audio 18-Bit A/D Converter Using Oversampling Techniques

An 18-bit A/D converter has been designed that uses the principle of oversampling rather than the succesive-approximation technique of most converters. The design employs a 2-stage digital filter/decimator to reduce the sampling rate. Unusual digital filter structures are used to reduce the computation rate to a particular level. Extension to 19 bits and beyond is discussed.